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Charge Transfer at Hybrid Interfaces: Plasmonics of Aromatic Thiol-Capped Gold Nanoparticles

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journal contribution
posted on 28.07.2015, 00:00 by Claire Goldmann, Rémi Lazzari, Xavier Paquez, Cédric Boissière, François Ribot, Clément Sanchez, Corinne Chanéac, David Portehault
Although gold nanoparticles stabilized by organic thiols are the building blocks in a wide range of applications, the role of the ligands on the plasmon resonance of the metal core has been mostly ignored until now. Herein, a methodology based on the combination of spectroscopic ellipsometry and UV–vis spectroscopy is applied to extract dielectric functions of the different components. It is shown that aromatic thiols allow a significant charge transfer at the hybrid interface with the s and d bands of the gold core that yields “giant” red shifts of the plasmon band, up to 40 nm for spherical particles in the size range of 3–5 nm. These results suggest that hybrid nanoplasmonic devices may be designed through the suitable choice of metal core and organic components for optimized charge exchange.